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        <h2 id="第一章-DBUtils"><a href="#第一章-DBUtils" class="headerlink" title="第一章 DBUtils"></a>第一章 DBUtils</h2><h3 id="1-1概述"><a href="#1-1概述" class="headerlink" title="1.1概述"></a>1.1概述</h3><p>DBUtils是JDBC的简化开发工具，需要项目引入jar包才能够正常的使用.<br><img src="http://i.imgur.com/kcgVP0G.png" alt="DBUtils的jar包"><br><br>DBUtils的<a href="http://commons.apache.org/proper/commons-dbutils/download_dbutils.cgi" title="download" target="_blank" rel="external">下载地址</a>.<br><br>DBUtils的三个核心功能介绍<br></p>
<ul>
<li>QueryRunner中提供对SQL语句的操作的api.<br></li>
<li>ResultSetHandler接口，用于定义select操作后，怎么样封装结果集</li>
<li>DBUtils类，一个工具类，定义了关闭资源与事务处理的方法</li>
</ul>
<h3 id="1-2QueryRunner核心类"><a href="#1-2QueryRunner核心类" class="headerlink" title="1.2QueryRunner核心类"></a>1.2QueryRunner核心类</h3><ul>
<li>update(Connection conn,String sql,Object …params),用于完成表数据的增删改操作；</li>
<li>query(Connection conn,String sql,ResultSetHandle<t> rsh,),用于完成表数据的查询操作</t></li>
</ul>
<h3 id="1-3QueryRunner实现添加、更新、删除操作"><a href="#1-3QueryRunner实现添加、更新、删除操作" class="headerlink" title="1.3QueryRunner实现添加、更新、删除操作"></a>1.3QueryRunner实现添加、更新、删除操作</h3><ul>
<li>update(Connection, String sql, Object …params) 用于完成表数据的添加、更新、删除操作</li>
</ul>
<h4 id="1-3-1-添加"><a href="#1-3-1-添加" class="headerlink" title="1.3.1 添加"></a>1.3.1 添加</h4><pre><code>public void insert(){
try{
    //获取一个用来执行SQL语句的对象QueryrRunner
    QueryRunner qr=new QueryRunner();
    String sql =&quot;INSERT INTO zhangwu(name,money,parent) VALUES(?,?,?)&quot;;
    Object[] params = {&quot;股票收入&quot;, 5500, &quot;收入&quot;};
    Connection conn = JDBCUtils.getConnection();
    int line = qr.update(conn,sql,params);// 用来完成表数据的增加、删除、更新操作
    //结果集处理

    }
}
</code></pre><h4 id="1-3-2-更新"><a href="#1-3-2-更新" class="headerlink" title="1.3.2 更新"></a>1.3.2 更新</h4><pre><code>public void update(){
try {
    //创建一个QueryRunner对象，用来完成SQL语句的执行
    QueryRunner qr = new QueryRunner();
    //执行SQL语句
    String sql = &quot;UPDATE zhangwu SET money = money+1000 WHERE name=?&quot;;
    Object[] params = {&quot;股票收入&quot;};
    Connection conn = JDBCUtils.getConnection();
    int line = qr.update(conn, sql, params);
    //结果集的处理
    System.out.println(&quot;line=&quot;+line);

} catch (SQLException e) {
    throw new RuntimeException(e);
    }
}
</code></pre><h4 id="1-3-3-删除"><a href="#1-3-3-删除" class="headerlink" title="1.3.3 删除"></a>1.3.3 删除</h4><pre><code>public void delete(){
try {
    //创建一个QueryRunner对象，用来完成SQL语句的执行
    QueryRunner qr = new QueryRunner();
    //执行SQL语句
    String sql = &quot;DELETE FROM zhangwu WHERE name = ?&quot;;
    Object[] params = {&quot;股票收入&quot;};
    Connection conn = JDBCUtils.getConnection();
    int line = qr.update(conn, sql, params);
    //结果集的处理
    System.out.println(&quot;line=&quot;+line);

} catch (SQLException e) {
    throw new RuntimeException(e);
    }
}
</code></pre><h3 id="1-4QueryRunner-实现查询操作"><a href="#1-4QueryRunner-实现查询操作" class="headerlink" title="1.4QueryRunner 实现查询操作"></a>1.4QueryRunner 实现查询操作</h3><ul>
<li>Qquery(Connection conn,String sql，ResultSetHandle<t> rsh, Object …params);</t></li>
</ul>
<h4 id="1-4-1ResultSetHandler结果集处理类"><a href="#1-4-1ResultSetHandler结果集处理类" class="headerlink" title="1.4.1ResultSetHandler结果集处理类"></a>1.4.1ResultSetHandler结果集处理类</h4><p><img src="https://i.imgur.com/RmGmYV0.png" alt="rsh结果处理类"></p>
<h4 id="1-4-2-JavaBean"><a href="#1-4-2-JavaBean" class="headerlink" title="1.4.2 JavaBean"></a>1.4.2 JavaBean</h4><p>JavaBean就是一个类，在开发中常用封装数据。具有如下特性：<br></p>
<ol>
<li>需要实现接口：java.io.Serializable ，通常实现接口这步骤省略了，不会影响程序;<br></li>
<li>提供私有字段：private 类型 字段名;<br></li>
<li>提供getter/setter方法;<br></li>
<li>提供无参构造.<br></li>
</ol>
<h4 id="1-4-3-ArryHandler与ArryListHandler查询"><a href="#1-4-3-ArryHandler与ArryListHandler查询" class="headerlink" title="1.4.3 ArryHandler与ArryListHandler查询"></a>1.4.3 ArryHandler与ArryListHandler查询</h4><pre><code>    ArrayHandler：将结果集中的第一条记录封装到一个Object[]数组中，数组中的每一个元素就是这条记录中的每一个字段的值。

public class ArrayHandlerDemo {
public void method(){
    try {
        //获取QueryRunner对象
        QueryRunner qr = new QueryRunner();
        //执行SQL语句
        String sql = &quot;SELECT * FROM zhangwu&quot;;
        Object[] params = {};
        Connection conn = JDBCUtils.getConnection();
        Object[] objArray = qr.query(conn, sql, new ArrayHandler(), params);
        //结果集的处理
        System.out.println( Arrays.toString(objArray) );

        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
        }
    }
}
</code></pre><hr>
<pre><code>    ArrayListHandler：将结果集中的每一条记录都封装到一个Object[]数组中，将这些数组在封装到List集合中。
public class ArrayListHandlerDemo {
public void method(){
    try {
        //获取QueryRunner对象
        QueryRunner qr = new QueryRunner();
        //执行SQL语句
        String sql = &quot;SELECT * FROM zhangwu WHERE money&gt;?&quot;;
        Object[] params = {2000};
        Connection conn = JDBCUtils.getConnection();
         List&lt;Object[]&gt; list = qr.query(conn, sql, new ArrayListHandler(), params);
        //结果集的处理
         for (Object[] objArray : list) {
            System.out.println(  Arrays.toString(objArray) );
        }

        conn.close();
    } catch (SQLException e) {
        e.printStackTrace();
        }
    }
}
</code></pre><h4 id="1-4-4BeanHandler与BeanListHandler查询"><a href="#1-4-4BeanHandler与BeanListHandler查询" class="headerlink" title="1.4.4BeanHandler与BeanListHandler查询"></a>1.4.4BeanHandler与BeanListHandler查询</h4><pre><code>    BeanHandler    ：将结果集中第一条记录封装到一个指定的javaBean中。
public class BeanHandlerDemo {
public void method(){
    try{
        //获取QueryRunner 
        QueryRunner qr = new QueryRunner();
        //执行SQL语句
        String sql = &quot;SELECT * FROM zhangwu WHERE id=?&quot;;
        Object[] params = {1};
        Connection conn = JDBCUtils.getConnection();
        ZhangWu zw = qr.query(conn, sql, new BeanHandler&lt;ZhangWu&gt;(ZhangWu.class), params);
        //结果集处理
        System.out.println(zw);

        conn.close();
    } catch(SQLException e){
        throw new RuntimeException(e);
        }
    }
}
</code></pre><hr>
<pre><code>    BeanListHandler    ：将结果集中每一条记录封装到指定的javaBean中，将这些javaBean在封装到List集合中.
public class BeanListHandlerDemo {
public void method(){
    try{
        //获取QueryRunner 
        QueryRunner qr = new QueryRunner();
        //执行SQL语句
        String sql = &quot;SELECT * FROM zhangwu WHERE money&gt;?&quot;;
        Object[] params = {2000};
        Connection conn = JDBCUtils.getConnection();
        List&lt;ZhangWu&gt; list = qr.query(conn, sql, new BeanListHandler&lt;ZhangWu&gt;(ZhangWu.class), params);
        //结果集处理
        for (ZhangWu zw : list) {
            System.out.println(zw);
        }
        conn.close();
    } catch(SQLException e){
        throw new RuntimeException(e);
        }
    }
}
</code></pre>
      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#第一章-DBUtils"><span class="nav-number">1.</span> <span class="nav-text">第一章 DBUtils</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#1-1概述"><span class="nav-number">1.1.</span> <span class="nav-text">1.1概述</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#1-2QueryRunner核心类"><span class="nav-number">1.2.</span> <span class="nav-text">1.2QueryRunner核心类</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#1-3QueryRunner实现添加、更新、删除操作"><span class="nav-number">1.3.</span> <span class="nav-text">1.3QueryRunner实现添加、更新、删除操作</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#1-3-1-添加"><span class="nav-number">1.3.1.</span> <span class="nav-text">1.3.1 添加</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#1-3-2-更新"><span class="nav-number">1.3.2.</span> <span class="nav-text">1.3.2 更新</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#1-3-3-删除"><span class="nav-number">1.3.3.</span> <span class="nav-text">1.3.3 删除</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#1-4QueryRunner-实现查询操作"><span class="nav-number">1.4.</span> <span class="nav-text">1.4QueryRunner 实现查询操作</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#1-4-1ResultSetHandler结果集处理类"><span class="nav-number">1.4.1.</span> <span class="nav-text">1.4.1ResultSetHandler结果集处理类</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#1-4-2-JavaBean"><span class="nav-number">1.4.2.</span> <span class="nav-text">1.4.2 JavaBean</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#1-4-3-ArryHandler与ArryListHandler查询"><span class="nav-number">1.4.3.</span> <span class="nav-text">1.4.3 ArryHandler与ArryListHandler查询</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#1-4-4BeanHandler与BeanListHandler查询"><span class="nav-number">1.4.4.</span> <span class="nav-text">1.4.4BeanHandler与BeanListHandler查询</span></a></li></ol></li></ol></li></ol></div>
            

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